Hi Mike,
On Thu, Dec 02, 2010 at 18:18:47, Michael Williamson wrote:
> > +static const struct da850_opp da850_opp_456 = {
> > + .freq = 456000,
> > + .prediv = 1,
> > + .mult = 19,
> > + .postdiv = 1,
> > + .cvdd_min = 1300000,
> > + .cvdd_max = 1350000,
> > +};
> > +
> > +static const struct da850_opp da850_opp_408 = {
> > + .freq = 408000,
> > + .prediv = 1,
> > + .mult = 17,
> > + .postdiv = 1,
> > + .cvdd_min = 1300000,
> > + .cvdd_max = 1350000,
> > +};
> > +
> > +static const struct da850_opp da850_opp_372 = {
> > + .freq = 372000,
> > + .prediv = 1,
> > + .mult = 31,
> > + .postdiv = 2,
> > + .cvdd_min = 1200000,
> > + .cvdd_max = 1320000,
> > +};
> > +
>
>
> Table 6-4 of the OMAP-L138 (rev B) spec indicates a maximum PLLOUT of 600 MHz.
Right.
> PLLOUT is defined in the table as the PLL Output frequency, it's not clear
> if that's before or after the post divider (seems like before given the block
> diagram in Figure 6-9 and a minimum value of 300 MHz).
Yup, PLLOUT is before the post divider.
>
> This OPP(372) results in a PLL of 744 MHz prior to the post divider.
>
> Is this a problem? Or am I reading the spec wrong?
Good point, I had this question too. With the current spec, it is not
possible to achieve any frequency between 300-400MHz on the ARM. However,
375 MHz parts are available.
The values I used are according to the recommendations of the hardware team
(around 8-9 months back)
Since the spec is still in contradiction, I am checking internally on when
the spec will be updated.
Kevin, can you please keep this patch on hold till I re-confirm on what the
final speced PLLOUT range will be and when the spec will be updated?
Thanks,
Sekhar
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